Geosolare Nahwärmeversorgung für die Siedlung "Zum Feldlager"

The planned new housing development “Zum Feldlager” (Kassel, Germany) is comprised of 131 buildings on a land area of 115,000 m². It will consist mainly of single family houses, resulting in a low building density. The developed heat supply system is a semi-decentralized concept based on an ultra-low-temperature district heating network (design temperatures: 40 °C supply, 25 °C return). The supply temperature ensures space heating. Supplementary components for domestic hot water preparation are needed. The heating system consists of:

• Distributed solar thermal systems (mounted on the building roofs) for domestic hot water preparation
• Uncovered solar thermal collector fields for thermal ground regeneration
• A central electrically driven ground source heat pump supplemented by a buffer storage and an electric peak load heater
• A borehole thermal energy storage 
• And a district heating network of 40°C supply and 25°C return temperature.

Within the joint research project a thermal simulation model is developed with the software TRNSYS. It comprises the heat supply units, the heat distribution network and the buildings. Based on that model, component design is optimized, different operating strategies are tested (including thermal ground regeneration and seasonal operating modes), and load management control strategies are analyzed. A key charactersitic of this innovative heat supply is the combination of state of the art technologies, but applying a seasonal operating to avoid unnecessary distribution heat losses through the thermal network. 

Duration: 2015/11 - 2018/08

The project is funded by the German Federal Ministry of Economic Affairs and Energy. (FKZ: 03ET1336C)